迪米特法則（Law of Demeter）又叫作最少知識原則（Least Knowledge Principle 簡寫LKP），就是說一個對象應當對其他對象有盡可能少的了解,不和陌生人說話。英文簡寫為: LoD.
類的設計接口盡量封裝完善，讓外部直接調用
#include<iostream>#include<string>#include<vector>using namespace std; class AbstractBuilding{public: virtual void sale() = 0; virtual string getQuality() = 0; }; class BuildingA :public AbstractBuilding{public: BuildingA() { mQulity = "高品質"; } virtual void sale() { cout << "樓盤A" << mQulity << "被售賣!" << endl; } virtual string getQuality() { return mQulity; } public: string mQulity;}; class BuildingB :public AbstractBuilding{public: BuildingB() { mQulity = "低品質"; } virtual void sale() { cout << "樓盤B" << mQulity << "被售賣!" << endl; } virtual string getQuality() { return mQulity; } public: string mQulity;}; // 中介類class Mediator{public: Mediator() { AbstractBuilding* building = new BuildingA; vBuilding.push_back(building); building = new BuildingB; vBuilding.push_back(building); } // 對外提供接口 AbstractBuilding* findMyBuilding(string quality) { for (vector<AbstractBuilding*>::iterator it = vBuilding.begin(); it != vBuilding.end(); it++) { if ((*it)->getQuality() == quality) { return *it; } } return NULL; } ~Mediator() { for (vector<AbstractBuilding*>::iterator it = vBuilding.begin(); it != vBuilding.end(); it++) { if (*it != NULL) delete *it; } }public: vector<AbstractBuilding*> vBuilding;}; void test01(){ Mediator* mediator = new Mediator; AbstractBuilding* building = mediator->findMyBuilding("低品質"); if (building != NULL) { building->sale(); } else { cout << "沒有符號條件的樓盤" << endl; } } int main(){ test01(); system("pause");}以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
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